Install instruction not working

[skal-dB]

Describe the bug I tried to install VNotes following the instructions here https://app.vnote.fun/en_us/#!docs/Developers/Build%20VNote.md but it doesn't work.

To Reproduce Following given instructions for installing Qt first

usr@mint:~$ sudo apt-get update -qq
usr@mint:~$ sudo apt-get -y install qt512base qt512webengine
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package qt512base
E: Unable to locate package qt512webengine

Expected behavior Installing Qt, then VNotes.

Desktop (please complete the following information):

• OS: Linux Mint Cinnamon
• Version 21.3